FluentValidation on number issue

Question

I am using FluentValidation in my ASP.NET MVC 3 application.

I have a MaxNumberTeamMembers property in my view model as such:

/// <summary>
/// Gets or sets the maximum number of team members.
/// </summary>
public int MaxNumberTeamMembers { get; set; }

I want to know if the following ruleset is possible:

• On the front end view, if the textbox is empty then I want a "MaxNumberTeamMembers is required" message to be displayed
• If the number entered is less than 1 then I want a message to display "MaxNumberTeamMembers should be greater or equal to 1".

What would the ruleset for the above look like?

I have the following but it does not work on the GreaterThan part if I enter 0:

RuleFor(x => x.MaxNumberTeamMembers)
     .NotEmpty()
     .WithMessage("Max. number of team members is required")
     .GreaterThan(0)
     .WithMessage("Max. number of team members must be greater than 0");

UPDATE 2011-02-14:

RuleFor(x => x.MinNumberCharactersCitation)
   .NotNull()
   .WithMessage("Min. number of characters for citation is required")
   .GreaterThanOrEqualTo(1)
   .WithMessage("Min. number of characters for citation must be greater than or equal to 1")
   .LessThanOrEqualTo(x => x.MaxNumberCharactersCitation)
   .WithMessage("Min. number of characters must be less than or equal to max. number of characters");

Answer 1

If you want to handle the empty case you need a nullable integer on your model because otherwise it is the default model binder that will automatically add a validation error when it tries to parse the empty string to a non-nullable integer:

public int? MaxNumberTeamMembers { get; set; }

and then you could have the following validation rules on this property:

RuleFor(x => x.MaxNumberTeamMembers)
    .NotEmpty()
    .WithMessage("Max. number of team members is required")
    .Must(x => x.Value > 0)
    .When(x => x.MaxNumberTeamMembers != null)
    .WithMessage("Max. number of team members must be greater than 0");

---

UPDATE:

The following works fine with the latest version of FluentValidation:

RuleFor(x => x.MaxNumberTeamMembers)
    .NotNull()
    .WithMessage("Max. number of team members is required")
    .GreaterThan(0)
    .WithMessage("Max. number of team members must be greater than 0");

Answer 2

it is work with FluentValidation version 3.2

RuleFor(x => x.MaxNumberTeamMembers)
    .NotNull()
    .WithMessage("Please Enter Value")
    .InclusiveBetween(1, 500)
    .WithMessage("Value must be number Beetween 1 , 500");